U.S. President Donald Trump welcomes South Korean President Moon Jae-in to the White House in Washington, U.S., June 29, 2017. REUTERS/Carlos Barria

South Korean and U.S. forces began computer-simulated military exercises on Monday amid tensions over North Korea’s missile and nuclear programs, amid reports that Pyongyang has generated at least $270 million since February despite U.N. sanctions.

South Korean President Moon Jae-in said the joint drills, called Ulchi Freedom Guardian, were purely defensive and did not aim to raise tensions on the peninsula.

The joint U.S.-South Korean drills will continue to Aug. 31 and involve computer simulations designed to prepare for war with a nuclear-capable North Korea. Read more at REUTERS.